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The Buzzards balance point.

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The Buzzards balance point.

Old 04-01-2007, 09:21 PM
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Cvans
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Default The Buzzards balance point.

I see after doing a search that there have been several different versions of this plane and as many different locations for the CG. Mine does have the built up tail surfaces. Any Ideas or help would still be appreciated. Otherwise I'm starting at 35% of the wing cord. and dual rates on the controls. Thanks again.

I wonder if you guys can help me. 30 years ago I was givin the oppurtunity to fly a Buzzard Bombshell. I loved it and have never forgot the experience. Last weekend I finally had the oppurtunity to purchase a very nice BB. It is the 72" version and I need to know how far back from the leading edge the CG is located. If you guys could help I would really appreciate it. The Lanzo Bomber had the CG marked but not the Buzzard. I can't wait to get it in the air.
The plane was originally powered with a .25 size engine and had about 6 ozs. of lead in the nose. I am powering it with an old Saito .40. I'm hoping that I won't need the lead and the sound will be great.
Thanks a bunch for any help that you can provide!
Chris
Old 04-02-2007, 12:41 AM
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burtcs
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Default RE: The Buzzards balance point.

Cvan:

For what it's worth, and I've been wrong before but an underchambered airfoil with a lifting stab it's around 50%. An associate used to fly a BB freeflight. He was using an OK Super Sixty. He gave me the 50% tip.

It's always been a good starting point. Try it with a hand glide, then adjust as needed. Also for what it's worth I used to fly a Zipper (ff) and a small (50") Playboy (RC texico) at 50%. If your using radio it should be mangable. I think a .40 four cycle will work just fine. Enjoy...

regards - Steve B.
Old 04-02-2007, 06:50 AM
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RFJ
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Default RE: The Buzzards balance point.

Chris,

The balance point shown on the RCM plan for the Bombshell is 4" back from the wing leading edge. This is the 72" version with a 12" wing chord so your 35% figure is reasonable.

The tailplane has a thin symmetrical section so a 50% balance point might be a bit "interesting" to fly.

Ray
Old 04-02-2007, 12:38 PM
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Cvans
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Default RE: The Buzzards balance point.

Thanks guys. I think I will start at the suggested forward CG and work my way back. I really appreciate your help!
Chris

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